Friction-clutch pulley.



No. 653,675. Patented luly l7, I900.

. H. o. HEM.

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(No Model.)

in/5M1 MC? QM w LZMQ K Y M %M% (J NITED STATES PATENT OFFICE.

HALVOR O. HEM, OF KANSAS CITY, KANSAS.

FRICTION-CLUTCH PULL E Y.

SPECIFICATION forming part of Letters Patent No. 653,675, dated July 17, 1900.

Application filed September 28, 1899. Serial No. 731 ,890. (No model.)

To (tZZ whom it may concern.-

Be it known that I, HALVOR O. HEM, a citizen of the United States, residing at Kansas City, Wyandotte county, Kansas, have invented certain new and useful Improvements in Friction-Clutch Pulleys, of which the following is a specification.

My invention relates to friction-clutch pulleys; and my objects are to produce a pulley of the character described which, first, will stay in line with the shaft; secondly, will enable long leverage to be obtained; thirdly, will eliminate chances of the levers getting loose and endangering life, and,fourthly, is ofsmall and compact construction. I attain these objects by a construction hereinafter described and claimed, and in order that the invention may be fully understood reference is to be had to the accompanying drawings,in which-- Figure 1 represents a perspective view of a friction-clutch pulley embodying my invention. Fig. 2 is a side view of the same. Fig. 3 is a vertical central section of the same. Fig. 4 is an enlarged vertical section of part of the same, the pulley in this figure being shown out of gear with the shaft.

Referring to the drawings in detail, the friction-pulley consists of the rim 1, the hub 2, and the spokes 3, the latter being provided with elongated openings, as at 3, crossed centrally by pivot-pins 4. 5 designates a series of arms or levers which extend through said openings 3 and are pivoted on the crosspins 4. At their ends nearest their fulcrumpoints said levers are pivoted by pins 6 to and between the angle-brackets 7, bolted or otherwise secured to and carrying the clutchshoes 8 of V shape in cross-section and adapted to engage frictionally the corresponding groove of the clutch-wheel 9, said wheel being rigidly secured upon the shaft 1-8 to one side of the pulley. As it is desirable that said clutch-wheel shall be as close as possible to the fulcrum-points of said levers in order that the entire device may be as compactly and powerfully built as possible, the spokes of the clutch-wheel extend obliquely outward from the hub and toward the pulley that the rim 9 of the former may be completely within the rim of the pulley and almost in contact with the spokes of the latter. The long arms of said levers 5 are bifurcated and carry crosspins 11, upon which are pivoted screws 12, and engaging the latter are turnbuckles 13, preferably of brass. Said turn buckles in turn also engage the oppositely-threaded screws 15, pivoted to the sliding sleeve 16, journaled on the shaft 18, said screws 15 being also engaged by lock-nuts l l-to lock the turnbuckles at the proper point after the proper'tension of the levers is obtained. I

17 designates a collar, preferably of brass, journaled in the groove 17 of the sleeve, and connecting said collar with a hand-lever 23 is a link 24:, in order that movement of the lever to one side or the other may impart a corresponding movement to sleeve 16 upon shaft 18. By means of this lever, which is fulcrumed at one end in any suitable or preferred manner, (not shown,) the sleeve is caused to move outward upon the shaft to throw the pulley out of gear by disengaging the clutch-shoes from the clutch-wheel, such movement being limited by the collar 22, se cured on the shaft,.(see Fig. 4,) or inward to throw the pulley into gear by causing the reengagement of the shoes and clutch-wheel, as shown in Fig. 3 most clearly, the inward movement of the sleeve being limited by contact with the collar 21, secured upon the shaft and also serving to hold the pulley in its proper relation to the clutch-wheel. The hub of this pulley is secttred by a set-screw 19 upon a bushing or sleeve 20, journaled upon the shaft, which bushing or sleeve may be taken out and bab'bitted after removing the pulley from the shaft. To accomplish this, of course it is necessary to disconnect the sleeve 16 from the levers 5 and remove the same, togetherwith collars 21 and 22. After the sleeve has been rebabbitted it is slipped into position and the collars and the sleeve 16 replaced upon the shaft and said sleeve again connected up to levers 5;

By the peculiar construction of this clutch it will be seen that it possesses the advantages enumerated as desirable in the statement of invention, and incidentally to, the same it will be noticed that the lovers are pivoted to the pulley in the plane of its center, thereby insuring that the axis of the pulley remains parallel and coincides withthe too axis of the shaft. A friction that holds the pulley on one end only causes the bushing to wear loose at the corresponding end after a comparatively-short period of service, thereby throwing the pulley out of line and cansing the bushing when the pulley is running to hammer against the shaft whether the friction is in gear or not. By my construction the sleeve 20 can even be taken out and the clutch will hold the pulley in perfect position. It has been a desideratum for a long time to obtain a construction which holds the pulley in line with the shaft, it having been attempted even to the extent of putting a friction on each side of the pulley. Another advantage is the extending of the levers through the pulley, whereby a smaller and more compact construction is obtained and longer and more powerful levers enabled to be used,'thereby reducing the wear to a minimum, and the pivoting of the levers in the openings on the spokes eliminates danger of their getting loose and flying out of position. A further advantage possessed by this construction is that it does not require an expert to put the clutch on the shaft or adjust it.

It is to be understood, of course, that I reserve the right to make such changes in the detailed construction, proportion, or arrangement of parts as will not be a departure from the spirit and scope or sacrifice anyof Qthe advantages of my invention.

Having thus described the invention, what I claim as new, and desire to secure by Letters Patent, is-- In a friction-clutch mechanism, the combination of a shaft, a pulley jonrnaled thereon, and provided with spokes having apertures 3 a clutch-wheel rigid on the shaft, consisting of a hub 10, a V-shaped rim inward of the vertical plane of the hub, and oblique spokes connecting the hub and the rim, a lever extending through each spoke-aperture and pivoted therein, a V-shaped shoe pivotally suspended from the short end of the lever and adapted to engage the clutch-wheel rim, a sliding sleeve 16 upon the shaft, bolts pivoted to said sleeve and said levers, turn buckles connecting said bolts, a collar 17 journaled in sleeve 16, a link pivoted to .collar 17, and a lever pivotally connecting-said link and adapted to shift collar 17 and sleeve 16 longitudinally on the shaft, substantially asdescri bed.

In testimony whereof I affix my signature in the presence of two witnesses.

HALVOR O. HEM. Witnesses:

JAMES J. CUFF, A. E. PETERSEN. 

